Security keeps people from entering the Lincoln Memorial in Washington, Tuesday, Aug. 23, 2011, after it was evacuated following an earthquake in the Washington area. A 5.9 magnitude earthquake centered in Virginia forced evacuations of all the monuments on the National Mall in Washington and rattled nerves from Georgia to Martha's Vineyard, the Massachusetts island where President Barack Obama is vacationing. No injuries were immediately reported. (AP Photo/Jacquelyn Martin)

Security keeps people from entering the Lincoln Memorial in Washington, Tuesday, Aug. 23, 2011, after it was evacuated following an earthquake in the Washington area. A 5.9 magnitude earthquake centered in Virginia forced evacuations of all the monuments on the National Mall in Washington and rattled nerves from Georgia to Martha's Vineyard, the Massachusetts island where President Barack Obama is vacationing. No injuries were immediately reported. (AP Photo/Jacquelyn Martin)

Earthquake rocks Washington area

•January 1, 1970

A 5.8 magnitude earthquake centered in Virginia shook much of Washington, D.C., and was felt as far north as New York City. (AP)